Woo, Heajung, Woocheol Kim, Yejih Yi, and & Gwansik Yoon. 2018. “Examining Training Performance of TVET Trainers With Without TVET Certificate in the Republic of Korea”. Journal of Technical Education and Training 10 (2). https://penerbit.uthm.edu.my/ojs/index.php/JTET/article/view/3070.